[pdal] writers.las unable to convert scaled value

[adam steer]

Hi Rebecca


> I ran lasinfo on the las file and get the following result:
> Z                3696      58127
>

Ah those are unscaled values - so scaled to metres it would be 36.96 and
581.27?

What would be the best way to determine if the geoid is introducing any
> divide-by-zeros?
>
> I loaded the gtx into postgis and these are the results from using the
> ST_SummaryStats:
>
> 'count' 'sum' 'mean' 'stddev' 'min' 'max'
> 14364 | 4215.86899040639 | 0.293502435979281 | 0.0288004424645927 |
> 0.17399999499321 | 0.49099999666214
>

That’s a cool way to do it! I wondered if there were null or nodata values
in the gtx file for some of your las points, but it appears not…

My last easy check idea is to make sure all the las points sit within
the moturiki 1953 region.

I don’t feel like I’m being super helpful, sorry - just walking down a list
of things that might produce an ‘-Infinity'….

Regards,

Adam


>
> Cheers
>
> Rebecca
>
> On Thu, Aug 22, 2019 at 3:50 PM adam steer <adam.d.steer at gmail.com> wrote:
>
>> Hi Rebecca
>>
>> What are the min and max Z values for your laz file? does it have a
>> sneaky infinite value in there?
>>
>> …and is your geoid grid introducing any divide-by-zeros to create
>> un-handleable values?
>>
>> Cheers
>>
>> Adam
>>
>
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